Migrating json API

[pitkant]

This quick fix enables using old method of data retrieval in a relatively unchanged manner. Problem described in issues #243 (thank you @djhurio for reporting) and #251 (thank you @minemR for reporting).

For additional information about the API change, see the following Eurostat resources:

• API Statistics - migrating from JSON web service to API Statistics
• API Statistics - data query

----EDIT
Fixed issue attribution

[codecov]

Codecov Report

Merging #252 (9f0bc9c) into master (97e3181) will increase coverage by 0.01%.
The diff coverage is 82.75%.

❗ Current head 9f0bc9c differs from pull request most recent head 9a3ab11. Consider uploading reports for the commit 9a3ab11 to get more accurate results

@@            Coverage Diff             @@
##           master     #252      +/-   ##
==========================================
+ Coverage   68.12%   68.14%   +0.01%     
==========================================
  Files          22       22              
  Lines         756      769      +13     
==========================================
+ Hits          515      524       +9     
- Misses        241      245       +4     

Impacted Files	Coverage Δ
R/get_eurostat_json.R	61.76% <79.16%> (+1.09%)	⬆️
R/get_bibentry.R	88.00% <100.00%> (ø)
R/get_eurostat_geospatial.R	92.61% <100.00%> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[antagomir]

Awesome, if this solves the issue for the time being.

Should then go to CRAN as well for the fix.